They had seven children, of whom only one survive adulthood:[1][2][better source needed] In addition to the reform policies of her husband in the Querfurt-Weissenfels tiny Duchy, Frederica Elisabeth brought considerable social impulse.

As a gift to her, Duke Johann Georg built the so-called Hermitage between Weissenfels and Langendorf, the Klein-Friedenthal (a summer palace), a zoo at Neuenburg Castle (Freyburg) and the garden at the Leisslinger Wiese.

Her husband was also prone to great courtly splendor, under which he specially made for Fredericka Elisabeth in 1710 the construction of an expensive small river port in Weissenfels.

After her husband's death and the accession of her brother-in-law Christian to the Ducal throne in 1712, she received Dryburg Castle in Langensalza as her Wittum (already designated to her in 1695), where she ordered the construction of a royal park before finally moved there in 1717.

[citation needed] Since her body had to be firstly embalmed before his long journey to Weissenfels, the extracted entrails were buried separately in an urn.